I have inherited a very old Craftsman 12″ bandsaw, about 60 yo. It still works well and cuts cleanly but there is a problem. Every once in a while the upper pulley comes off. I’ve adjusted the belt tension, aligned the pulleys and the blade also. The drive belt, probably original, shows no sign of wear. The pulley fits tight enough that a few mild taps with a hammer reseats it. The set screw is as tight as I can make it by hand. Does anybody see something I’ve missed? Do pulleys or keys wear out or become slightly deformed over time?
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